So we have a thrown at school before the teachers' room, and I have to say the smell was really strong. The yellow skate just under the old rotten cheese. As our teacher has wiped it he had to pass it, and then go home: D all the staff room + the Aula were at least 4 hours surrounded by the stench. The smell adheres genuine long. Simply cool the things to a trick, or other to do with it;) PS: do not be caught if you "let go" the stink bombs, which could otherwise give real trouble: D